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{-# LANGUAGE GADTs #-}
{-# OPTIONS_GHC -Wall #-}
module Hooks.PhasePlugin (plugin) where
import GHC.Plugins
import GHC.Driver.Hooks
import GHC.Tc.Utils.Monad
import GHC.Driver.Pipeline.Execute
import GHC.Driver.Pipeline.Phases
import System.IO
plugin :: Plugin
plugin = defaultPlugin { driverPlugin = hooksP }
hooksP :: [CommandLineOption] -> HscEnv -> IO HscEnv
hooksP opts hsc_env = do
hSetBuffering stdout NoBuffering
let hooks = hsc_hooks hsc_env
hooks' = hooks { runPhaseHook = Just fakeRunPhaseHook }
hsc_env' = hsc_env { hsc_hooks = hooks' }
return hsc_env'
fakeRunPhaseHook :: PhaseHook
fakeRunPhaseHook = PhaseHook $ \tPhase -> do
liftIO $ case tPhase of
T_Cpp{} -> putStrLn "Cpp hook fired"
T_Hsc{} -> putStrLn "Hsc hook fired"
T_FileArgs{} -> putStrLn "FileArgs hook fired"
_ -> pure ()
runPhase tPhase
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